CN103134304A - Roasting shaft furnace - Google Patents
Roasting shaft furnace Download PDFInfo
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- CN103134304A CN103134304A CN2011103802528A CN201110380252A CN103134304A CN 103134304 A CN103134304 A CN 103134304A CN 2011103802528 A CN2011103802528 A CN 2011103802528A CN 201110380252 A CN201110380252 A CN 201110380252A CN 103134304 A CN103134304 A CN 103134304A
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Abstract
The invention discloses a roasting shaft furnace which comprises a furnace body, more than two combustion chambers and a drying bed located at the top of the furnace body. An inner cavity of the furnace body is sequentially divided into a drying section, a roasting section, a soaking section and a cooling section from top to bottom. The combustion chambers are located at the position, corresponding to the roasting section, of the lateral side of the furnace body and communicated with the inner cavity of the furnace body. A hot air return assembly is arranged on the furnace body. An air inlet end of the hot air return assembly is communicated with the position, located at the bottoms of the combustion chambers, of the inner cavity of the furnace body. An air outlet end of the hot air return assembly is communicated with the position, located between the tops of the combustion chambers and the drying bed, of the inner cavity of the furnace body. The roasting shaft furnace has the advantages of being simple and compact in structure, low in cost, long in service life, stable and reliable in working, strong in operational adjustment, capable of optimizing furnace inside atmosphere and reducing energy consumption for material roasting, even in heating and the like.
Description
Technical field
The present invention is mainly concerned with mineral roasting apparatus field, refers in particular to a kind of roasting shaft furnace.
Background technology
Shaft furnace is widely used in oxidizing roasting or the DRI field of iron ore pellets, and be used for the oxidizing roasting of iron ore pellets in iron and steel metallurgical industry or directly pelletizing be reduced to iron, be indispensable process equipment in Ferrous Metallurgy; Simultaneously, the roasting that it also can be used for the lump materials such as lime stone dolomite is used for producing lime, is very general a kind of roasting apparatus.Shaft furnace is as a kind of roasting apparatus, compares with rotary kiln to have little, the advantages such as flow process is few, whole reduced investment of occupation of land, has very high promotional value for mini-medium mill.
Common shaft furnace structure is as shown in Figure 1: material is from body of heater 7 top clothes, by drying bed 1 drying that is positioned at the top, and operation downwards; The required heat of roasting is mainly supplied with by the combustion chamber 4 of body of heater 7 both sides.Material is from top to bottom successively by zones such as dryer section 701, furnace zone 702, soaking zone 703, cooling sections 704, and the cooling air that the air blast 5 that is cooled after material arrives cooling section 704 blasts is cooling, and pelletizing is cooled to be discharged by material discharging machine 6 after lower temperature.Most of cooling air is by after cooling section 704, absorbed pelletizing heat after temperature raise, and flow into drying bed 1 time from middle part air-guiding wall 2.
Wherein, middle part air-guiding wall 2 is very important parts in the shaft furnace structure, and its effect is the cold wind that shunting comes up from cooling section 704 drums, and in figure shown in arrow is namely the distinguished and admirable trend of shaft furnace.In order not allow the high temperature pellet of furnace zone 702 be subject to affecting from the cold wind that cooling section 704 drums in bottom come up, be provided with middle part air-guiding wall 2 in furnace zone 702 and dryer section 701, so just can allow a part of cold wind shed from middle part air-guiding wall 2 intermediate distributaries to furnace roof.Be provided with water beams 3 below middle part air-guiding wall 2, its effect is the gravitational load of bearing middle part air-guiding wall 2, must pass into recirculated cooling water and not be subject to temperatures involved with the load bearing stength that guarantees beam in water beams 3.
Although the shaft furnace type of furnace of said structure is simple, has many disadvantages:
1) life-span of middle part air-guiding wall 2 is extremely short: middle part air-guiding wall 2 is due to the restriction that is subjected to water beams 3 and body of wall, life-span is extremely short, more than a year the longest, the shortest tens days, and maintenance changes very trouble, in case middle part air-guiding wall 2 collapses, needs the long time to repair, have a strong impact on production, workman's maintenance intensity and environment facies are when abominable simultaneously.
2) middle part air-guiding wall 2 has been arranged, shaft furnace need to arrange the large-scale cooling device that adapts to it, brings the series of problems such as equipment maintenance cost is high, the time between overhauls(TBO) is short, the stove operating rate is low, body of heater investment cost height thereupon.
3) length of water beams 3 is unsuitable long, thereby longly can cause the too high effect that loses cooling Liang Bi of water temperature inside.And indirectly caused the Classical Shaft Furnace size to maximize to the restriction of water beams 3 length, brought loss to iron and steel enterprise.
4) because shaft furnace only leans on 4 heat supplies of two side combusion chambers, temperature can't be regulated evenly by four sections and distribute, the easy like this pellet dross in descending process that causes, often needing to cause the clear kiln of blowing out, human and material resources to steel plant have all caused great burden, have also had a strong impact on year operating rate and annual production simultaneously.
Summary of the invention
The technical problem to be solved in the present invention just is: the energy consumption, order heating that for the technical problem that prior art exists, the invention provides a kind of simple and compact for structure, with low cost, long service life, working stability is reliable, the operation modulability is stronger, can optimize furnace atmosphere, reduces the roasting material be vertical baking furnace more uniformly.
For solving the problems of the technologies described above, the present invention by the following technical solutions:
A kind of vertical baking furnace, comprise body of heater, plural combustion chamber and the drying bed that is positioned at the body of heater top, be divided into successively dryer section, furnace zone, soaking zone and cooling section in the inner chamber of described body of heater from top to bottom, described combustion chamber is positioned at the position corresponding with furnace zone, body of heater side and is communicated with the body of heater inner chamber, described body of heater is provided with backheat wind assembly, the air intake of described backheat wind assembly is communicated with the body of heater inner chamber that is positioned at combustion chamber bottom, the outlet air end of described backheat wind assembly be communicated with body of heater inner chamber between drying bed at top of combustion chamber.
As a further improvement on the present invention:
Described backheat wind assembly comprises one group of above blower fan and hot air duct.
Described hot air duct is provided with high temperature adjustable valve.
The opening at described hot air duct outlet air end place is obliquely to be arranged.
That described furnace zone, soaking zone and cooling section place are equipped with is parallel with the combustion chamber placement direction, laterally be arranged in the burning beam in the body of heater inner chamber.
Described burning beam comprises cavity and is installed in more than one middle burner assembly in cavity, and the bottom of described cavity offers the flame ejiction opening, and described cavity is enclosed by many water-cooled beams overlap joints and forms.
Be enclosed with refractory masses on the outer surface of described water-cooled beam.
The many water-cooled beams at place, described cavity top from top to bottom overlap successively and form two-layer above clad structure.
Described refractory masses is circular-arc being positioned at place, chamber outer surface top, perhaps described refractory masses in the bottom that is positioned at cavity, place, flame ejiction opening both sides is circular-arc.
Middle part in described cavity is provided with horizontal partition panel, being supported at both ends on water-cooled beam of described horizontal partition panel, and described middle burner assembly is installed on horizontal partition panel.
Compared with prior art, the invention has the advantages that:
1, vertical baking furnace of the present invention by backheat wind assembly is set, has become the both sides wind-guiding by the middle part wind-guiding, has fully phased out traditional air-guiding wall and water beams structure; And replaced by backheat wind assembly just because of air-guiding wall, the problem that in the past is subjected to the water beam length to limit the body of heater that can't maximize also is readily solved.Not only overcome the problem that traditional air-guiding wall life-span is short, maintenance cost is high and air quantity can't be regulated,
2, in vertical baking furnace of the present invention, many middle burning beams are set, by regulating the combustion intensity of burning beam, can effectively temperature in stove be pressed drying, roasting, soaking, cooling four sections evenly distributions, thereby reduce pellet dross phenomenon, increase shaft furnace operating rate and output.
3, middle burning beam is arranged at the middle burner assembly at the middle part of whole burning beam, under the protection of water-cooled beam action and refractory masses, it is worked all the time in environment of safety at a relative low temperature, has extended its service life.Simultaneously, also further by increasing refractory masses, it is wrapped up, reduce the method for cooling chamber temperature, make existing oil cooling structure into water-cooling structure, reduced investment and maintenance cost, and further reduced the consumption of oily resource, saved cost.
Description of drawings
Fig. 1 is the structural representation of shaft furnace in prior art;
Fig. 2 is the structural representation of vertical baking furnace in the present invention;
Fig. 3 is the structural representation of burning beam in the present invention;
Fig. 4 is that B in Fig. 3 is to structural representation;
Fig. 5 is the sectional structure schematic diagram at A-A place in Fig. 3;
Fig. 6 is the structural representation of burning beam the first cavity profile in specific embodiment;
Fig. 7 is the structural representation of burning beam the second cavity profile in specific embodiment;
Fig. 8 is the structural representation of the third cavity profile of burning beam in specific embodiment;
Fig. 9 is the structural representation of the 4th kind of cavity profile of burning beam in specific embodiment.
Marginal data:
1, drying bed; 2, middle part air-guiding wall; 3, water beams; 4, combustion chamber; 5, cooling air blower; 6, backheat wind assembly; 61, hot air duct; 63, high temperature adjustable valve; 7, body of heater; 701, dryer section; 702, furnace zone; 703, soaking zone; 704, cooling section; 8, burning beam; 801, cavity; 802, middle burner assembly; 803, flame ejiction opening; 804, water-cooled beam; 805, refractory masses; 806, horizontal partition panel; 807, anchor studs; 808, gas pipe; 809, burner spout.
The specific embodiment
Below with reference to Figure of description and specific embodiment, the present invention is described in further details.
As shown in Figure 2, vertical baking furnace of the present invention, comprise body of heater 7, plural combustion chamber 4 and the drying bed 1 that is positioned at body of heater 7 tops, be divided into successively various air-flows direction of arrow operation as shown in dryer section 701, furnace zone 702, soaking zone 703 and cooling section 704(stove in the inner chamber of body of heater 7 from top to bottom), combustion chamber 4 is positioned at the position corresponding with furnace zone 702, body of heater 7 sides and is communicated with the body of heater inner chamber.Body of heater 7 is provided with backheat wind assembly 6, and the air intake of backheat wind assembly 6 is communicated with the body of heater inner chamber that is positioned at 4 bottoms, combustion chamber, the outlet air end of backheat wind assembly 6 be communicated with body of heater inner chamber between drying bed 1 at 4 tops, combustion chamber.In the present embodiment, backheat wind assembly 6 is communicated with the body of heater inner chamber at soaking zone 703 places.Can extract low warm airs out from body of heater 7 soaking zone 703 both sides by backheat wind assembly 6, concentrate the top, drying bed of backward upper importing combustion chamber 4 below 1, be used for dried material; So just become the both sides wind-guiding by the middle part wind-guiding, fully phased out traditional air-guiding wall and water beams structure, and replaced by backheat wind assembly 6 just because of air-guiding wall, the problem that in the past is subjected to the water beam length to limit the body of heater that can't maximize also is readily solved.
In the present embodiment, backheat wind assembly 6 comprises one group of above blower fan and hot air duct 61.Be provided with high temperature adjustable valve 63 on hot air duct 61, every hot air duct 61 all can be regulated arbitrarily air quantity by high temperature adjustable valve 63 like this, controls dry gas stream and regulates furnace atmosphere.
In the present embodiment, the opening at hot air duct 61 outlet air end places is obliquely to be arranged, can effectively prevent from managing interior dust stratification.
In the present embodiment, be equipped with, laterally burning beam 8 be arranged in body of heater inner chamber in parallel with combustion chamber 4 arranged direction at furnace zone 702, soaking zone 703 and cooling section 704 places.In process of production, by regulating the combustion intensity of three burning beams 8, but the Temperature Distribution of Effective Regulation roasting, soaking and cooling three sections be conducive to temperature in stove is evenly distributed by section, thereby reduce pellet dross phenomenon, increase shaft furnace operating rate and output.
As Fig. 3, Fig. 4 and shown in Figure 5; burning beam 8 in the present invention; comprise cavity 801 and be installed in the interior more than one middle burner assembly 802 of cavity 801; the bottom of cavity 801 offers flame ejiction opening 803; cavity 801 is enclosed by many water-cooled beams 804 overlap joints and forms; water-cooled beam 804 passes into recirculated water when work, the temperature when working to reduce middle burner assembly 802, thereby protection middle burner assembly 802.Water-cooled beam 804 can adopt seamless steel pipe, and it is firm in structure, and weight capacity is strong, and is not easily broken, and the phenomenon of seepage can not occur.By making existing oil cooling structure into water-cooling structure, reduced investment and maintenance cost, also further reduced the consumption of oily resource, save cost.
In the present embodiment, be enclosed with refractory masses 805 on the outer surface of several water-cooled beam 804 cavitys that form 801, this refractory masses 805 is used for water-cooled beam 804 and middle burner assembly 802 are kept apart from abominable working environment, to extend their life-span.Referring to Fig. 3, Fig. 4, Fig. 5 and Fig. 6, be connected by anchor studs 807 between water-cooled beam 804 and refractory masses 805, between anchor studs 807 and water-cooled beam 804 by being welded and fixed.Like this, middle burner assembly 802 middle parts that are positioned at whole burning beam under the protection of the effect of water-cooled beam 804 and refractory masses 805, are able at a relative low temperature and work in the environment of safety.
Because the High Temperature Gas in cavity 801 is known from experience up liter, therefore can form a high-temperature area at the top of cavity 801, make under its hot soak condition.In the present embodiment, the many water-cooled beams 804 that further make cavity 801 tops places from top to bottom successively overlap joint form two-layer above clad structure, be used for strengthening the cooling effect at this place, also can be in order to heat insulation, load-bearing and the impact resistance that strengthens whole burning beam.Above-mentioned by the many water-cooled beams 804 two-layer above clad structure that forms of overlap joint successively from top to bottom, the shape in its cross section can be triangle, trapezoidal etc.
In the present embodiment, refractory masses 805 be positioned at cavity 801 outer surface tops and bottom the place be circular-arc.It is in order to make material be difficult for can playing protection burning beam action in cavity top accumulation that the place, top of cavity 801 outer surfaces is circular-arc.And to be circular-arc be in order to make the sectorial area that jets out flames wider, can to play certain water conservancy diversion and revise the shape effect flame cavity 801 bottoms, flame ejiction opening 803 places, both sides, thereby homogeneous heating is treated roasting material, the overheavy firing effect.
In other embodiments, as shown in Figure 6, refractory masses 805 also can be the right-angle side form at the place, bottom of cavity 801; Or as shown in Figure 7, refractory masses 805 can be also that step-like, topmost is flat face for the right-angle side form and at the top of cavity 801 at place, the bottom of cavity 801; Or as shown in Figure 8, refractory masses 805 is only step-like at the top of cavity 801, and topmost is flat face; Or as shown in Figure 9, refractory masses 805 is only tip-angled shape at the top of cavity 801.
In the present embodiment, middle burner assembly 802 comprises gas pipe 808 and the more than one burner spout 809 that is connected on gas pipe 808.Referring to Fig. 3, the middle part in cavity 801 is provided with horizontal partition panel 806, and on water-cooled beam 804, gas pipe 808 just is erected on horizontal partition panel 806, can directly extract and insert during replacing, and is very convenient by Weld-supporting at the two ends of horizontal partition panel 806.
In production process, a flame ejiction opening 803 is just arranged on the gas pipe 808 of middle burner assembly 802 at a certain distance, air mixed combustion with in cavity 801 jets out flames equably and is fan-shaped along arc refractory masses 805 and disperse out, to the roasting of material homogeneous heating.Simultaneously, do not stop to have water circulation water-cooled beam 804 wherein constantly to carry out heat exchange with middle burner assembly 802 ambient airs, the operating temperature of reduction middle burner assembly 802.Outside refractory masses 805 tightly wraps up above-mentioned all devices, has also played water conservancy diversion and the effect of revising flame profile in the protection interior arrangement, makes the igniting effect more desirable, and product quality is better.
Be only below the preferred embodiment of the present invention, protection scope of the present invention also not only is confined to above-described embodiment, and all technical schemes that belongs under thinking of the present invention all belong to protection scope of the present invention.Should be pointed out that for those skilled in the art, the some improvements and modifications not breaking away under principle of the invention prerequisite should be considered as protection scope of the present invention.
Claims (10)
1. vertical baking furnace, comprise body of heater (7), plural combustion chamber (4) and the drying bed (1) that is positioned at body of heater (7) top, be divided into successively dryer section (701) in the inner chamber of described body of heater (7) from top to bottom, furnace zone (702), soaking zone (703) and cooling section (704), described combustion chamber (4) is positioned at the position corresponding with furnace zone (702), body of heater (7) side and is communicated with the body of heater inner chamber, it is characterized in that: described body of heater (7) is provided with backheat wind assembly (6), the air intake of described backheat wind assembly (6) is communicated with the body of heater inner chamber that is positioned at bottom, combustion chamber (4), the outlet air end of described backheat wind assembly (6) be positioned at top, combustion chamber (4) and be communicated with body of heater inner chamber between drying bed (1).
2. vertical baking furnace according to claim 1, is characterized in that: blower fan and hot air duct (61) more than described backheat wind assembly (6) comprises one group.
3. vertical baking furnace according to claim 2, it is characterized in that: described hot air duct (61) is provided with high temperature adjustable valve (63).
4. vertical baking furnace according to claim 2 is characterized in that: the opening at described hot air duct (61) outlet air end place is obliquely to be arranged.
5. according to claim 1 and 2 or 3 or 4 described vertical baking furnaces is characterized in that: described furnace zone (702), soaking zone (703) and cooling section (704) locate to be equipped with parallel with combustion chamber (4) arranged direction, laterally be arranged in burning beam (8) in the body of heater inner chamber.
6. vertical baking furnace according to claim 5, it is characterized in that: described burning beam (8) comprises cavity (801) and is installed in the interior more than one middle burner assembly (802) of cavity (801), the bottom of described cavity (801) offers flame ejiction opening (803), and described cavity (801) is enclosed by many water-cooled beams (804) overlap joint and forms.
7. vertical baking furnace according to claim 6, is characterized in that: be enclosed with refractory masses (805) on the outer surface of described water-cooled beam (804).
8. vertical baking furnace according to claim 6 is characterized in that: the many water-cooled beams (804) at place, described cavity (801) top from top to bottom successively overlap joint form two-layer above clad structure.
9. vertical baking furnace according to claim 6, it is characterized in that: described refractory masses (805) is circular-arc being positioned at place, cavity (801) outer surface top, perhaps described refractory masses (805) in the bottom that is positioned at cavity (801), place, flame ejiction opening (803) both sides is circular-arc.
10. vertical baking furnace according to claim 6, it is characterized in that: the middle part in described cavity (801) is provided with horizontal partition panel (806), being supported at both ends on water-cooled beam (804) of described horizontal partition panel (806), described middle burner assembly (802) is installed on horizontal partition panel (806).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110380252.8A CN103134304B (en) | 2011-11-25 | 2011-11-25 | A kind of vertical baking furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110380252.8A CN103134304B (en) | 2011-11-25 | 2011-11-25 | A kind of vertical baking furnace |
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| CN103134304A true CN103134304A (en) | 2013-06-05 |
| CN103134304B CN103134304B (en) | 2015-08-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110380252.8A Active CN103134304B (en) | 2011-11-25 | 2011-11-25 | A kind of vertical baking furnace |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1062767A (en) * | 1991-08-17 | 1992-07-15 | 萍乡钢铁厂 | Shaft furnace process is produced the technology and the equipment of limonite pelletizing |
| CN2545553Y (en) * | 2002-05-29 | 2003-04-16 | 于国强 | Light-burned magnesia kiln |
| CN2854475Y (en) * | 2005-12-23 | 2007-01-03 | 唐山市磁石矿冶科贸有限公司 | Energy-saving large envenronoment protection type oxidation pelletizing roasting shaft furnace |
| CN2861914Y (en) * | 2005-09-17 | 2007-01-24 | 张清学 | Steelmaking mud ball baking shaft stove |
| CN201258298Y (en) * | 2008-07-25 | 2009-06-17 | 贾会平 | Kiln for burning lime |
| CN201626918U (en) * | 2010-02-23 | 2010-11-10 | 杨霞 | Energy-saving lime kiln |
| CN102052826A (en) * | 2010-12-23 | 2011-05-11 | 马全才 | Energy-efficient shaft kiln |
| CN202329065U (en) * | 2011-11-25 | 2012-07-11 | 中冶长天国际工程有限责任公司 | Roasting vertical furnace |
-
2011
- 2011-11-25 CN CN201110380252.8A patent/CN103134304B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1062767A (en) * | 1991-08-17 | 1992-07-15 | 萍乡钢铁厂 | Shaft furnace process is produced the technology and the equipment of limonite pelletizing |
| CN2545553Y (en) * | 2002-05-29 | 2003-04-16 | 于国强 | Light-burned magnesia kiln |
| CN2861914Y (en) * | 2005-09-17 | 2007-01-24 | 张清学 | Steelmaking mud ball baking shaft stove |
| CN2854475Y (en) * | 2005-12-23 | 2007-01-03 | 唐山市磁石矿冶科贸有限公司 | Energy-saving large envenronoment protection type oxidation pelletizing roasting shaft furnace |
| CN201258298Y (en) * | 2008-07-25 | 2009-06-17 | 贾会平 | Kiln for burning lime |
| CN201626918U (en) * | 2010-02-23 | 2010-11-10 | 杨霞 | Energy-saving lime kiln |
| CN102052826A (en) * | 2010-12-23 | 2011-05-11 | 马全才 | Energy-efficient shaft kiln |
| CN202329065U (en) * | 2011-11-25 | 2012-07-11 | 中冶长天国际工程有限责任公司 | Roasting vertical furnace |
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| CN103134304B (en) | 2015-08-19 |
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